A method for producing a chloroprene-based polymer composition including a polymerization step, wherein chloroprene, or chloroprene and a monomer copolymerizable with chloroprene are polymerized; and includes monomer and emulsifier addition steps, when a total amount of monomer used in the polymerization step is 100%, an initial addition amount of monomer at start of polymerization is X %; in the monomer addition step, when the initial addition amount of the monomer is 100%, a remaining monomer is added to the polymerization system from time when polymerization progresses and Y % of the monomer initially added converts, by reaching the polymerization completion conversion; in the emulsifier addition step, when the total amount of monomer used in the polymerization step is 100%, emulsifier is added from time when polymerization progresses and Z % of the monomer converts by reaching the polymerization completion conversion; and X, Y and Z satisfy following relationship, 1<XY/100<40, 20<Z<75. ?65<Y?Z<50

The present disclosure relates to the technical field of adhesion property improvement, particularly to a process and device for improvement treatment of a polyester cord and a rubber adhesive. By filling an extremely few amount of calcined gypsum powders into chloroprene rubber to be secondarily stirred and extruded while adding fatty acid calcium and an anti-aging agent and uniformly mixing a stirring and mixing component using a specific solvent, the adhesion behavior between the rubber adhesive and the polyester cord is increased, and the bonding strength between the rubber adhesive and the polyester cord is improved; furthermore, through mutual connection and installation of the extrusion modification component, stirring and mixing component and the compounding modification component, continuous operation of modification treatment of the polyester cord and the rubber adhesive, the structure is simple, and use is convenient. .

A chloroprene polymer latex composition being a mixture of a chloroprene polymer latex A and a chloroprene polymer latex B, in which a 2,3-dichloro-1,3-butadiene copolymerized amount in a chloroprene polymer of the chloroprene polymer latex B is 3% by mass or more, a toluene insoluble content of the chloroprene polymer of the chloroprene polymer latex B is 70% by mass or more, a weight average molecular weight of a toluene soluble content in the chloroprene polymer latex A is 5,000 to 250,000, and a specific mass ratio b/a is 0.10 or more.

A chloroprene polymer latex containing: a chloroprene polymer, at least one selected from the group consisting of rosin acid, sodium rosinate, and potassium rosinate; and at least one selected from the group consisting of sodium hydroxide and potassium hydroxide, in which a toluene insoluble content of the chloroprene polymer is 10% by mass or less, and a weight average molecular weight of a toluene soluble content is 5,000 to 200,000.

A chloroprene polymer containing at least one selected from the group consisting of a homopolymer of chloroprene and a copolymer of chloroprene with 2,3-dichloro-1,3-butadiene, in which in gel permeation chromatography measurement of a toluene soluble content, the chloroprene polymer has a first peak having a weight average molecular weight of 500,000 to 900,000 and a second peak having a weight average molecular weight of 7,000 to 80,000, and a toluene insoluble content is 60% by mass or more.

One embodiment of the present invention relates to a chloroprene copolymer latex, a method for producing a chloroprene copolymer latex, a chloroprene copolymer latex composition, and a molded article or dipped product of a chloroprene copolymer rubber. The chloroprene copolymer latex is a latex of a chloroprene copolymer including monomer units derived from 2-chloro-1,3-butadiene (chloroprene) and monomer units derived from 2-methyl-1,3-butadiene, wherein the tetrahydrofuran insoluble content in the chloroprene copolymer is 20% by mass or less, and the proportion of the monomer units derived from 2-methyl-1,3-butadiene is 10 to 27 mol % in the chloroprene copolymer.

Aspects of the disclosure relate to techniques for manufacturing a balloon envelope. In one example, a first sheet of material for a first gore of the balloon envelope is provided. Lap seal material is arranged at least partially on the first sheet of material. A first heat seal is created between the lap seal material and the first sheet of material. A second sheet of material for a second gore of the balloon envelope is arranged over the first heat seal. A second heat seal is created between the lap seal material and the second sheet of material such that the lap seal material is configured to provide additional structural support to the balloon envelope.

Aspects of the disclosure relate to techniques for manufacturing a balloon envelope. In one example, a first sheet of material for a first gore of the balloon envelope is provided. Lap seal material is arranged at least partially on the first sheet of material. A first heat seal is created between the lap seal material and the first sheet of material. A second sheet of material for a second gore of the balloon envelope is arranged over the first heat seal. A second heat seal is created between the lap seal material and the second sheet of material such that the lap seal material is configured to provide additional structural support to the balloon envelope.

Aspects of the disclosure relate to systems and techniques for inspecting seals for high altitude balloons. In one example, a system may include a reflective surface, a translucent material on the reflective surface, and a movable light source configured to move along the reflective surface and provide light to the reflective surface. The light is provided such that it is reflected from the reflective surface and through the translucent material in order to backlight a balloon envelope seal for inspection. A method for inspecting a balloon envelope seal may include placing balloon envelope material on a table, forming a seal between portions of the material, moving a light over the seal, shining light onto a reflective portion of the table below the seal to backlight the seal, and inspecting the seal using the backlighting of the seal.

Aspects of the disclosure relate to systems and techniques for inspecting seals for high altitude balloons. In one example, a system may include a reflective surface, a translucent material on the reflective surface, and a movable light source configured to move along the reflective surface and provide light to the reflective surface. The light is provided such that it is reflected from the reflective surface and through the translucent material in order to backlight a balloon envelope seal for inspection. A method for inspecting a balloon envelope seal may include placing balloon envelope material on a table, forming a seal between portions of the material, moving a light over the seal, shining light onto a reflective portion of the table below the seal to backlight the seal, and inspecting the seal using the backlighting of the seal.